Resetting column sequence in SQL

Hi All, I have a simple requirement but I cant think of the solution...
to simplify the problem, I have a master field and its child field, I need another column to bring back a sequence starting from 1...n and resetting itself back to 1 when a new master records starts eg...
Master_id child_id seq
200 100 1
200 105 2
200 120 3
205 151 1
205 159 2
300 170 1
ect
If a solution can be done using purely SQL, that would be ideal
also please note there is no arithmetic relationshp between the master rec and its child rec
Kind Regards
Satnam

SQL> select m,c,row_number() over(partition by m order by rownum) r from sqn;
      M       C       R
    200     100       1
    200     105       2
    200     120       3
    205     150       1
    205     160       2
    210     300       1
    210     305       2
7 rows selected.
"sorry Avinash, not seen your post you already suggested the same"Message was edited by:
Jameel

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Resetting the Sequence operator in OWB

I have a Sequence operator for one column in the mapping. It correctly increments by 1 for each row (nextval) . I have done some testing and now I want to reset the next increments. Like I want to start from 1 instead of some 588 like that which is result of my testing.
How to reset the sequence operator so that it starts from 1 again.
Thanks

Hi Tom,
First you should create a store procedure that resets the last_number of a specified sequence w/ parameters sequence_name and start value. Then just call the stored proc from OWB to reset your sequence.
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seq_name IN VARCHAR2, startvalue IN PLS_INTEGER) AS
cval INTEGER;
inc_by VARCHAR2(25);
BEGIN
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cval := cval - startvalue + 1;
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inc_by := ' INCREMENT BY ';
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SEQ_NAME VARCHAR2(200);
STARTVALUE PLS_INTEGER;
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Hope it works! Cheers!=)
Regards,
Carlo

Changing Column Sequence

Hi,
How to change the column sequence with out recreating a table?
Exapmle :
SQL> desc emp
Name Null? Type
EMPNO NOT NULL NUMBER(4)
ENAME VARCHAR2(10)
JOB VARCHAR2(9)
MGR NUMBER(4)
HIREDATE DATE
SAL NUMBER(7,2)
COMM NUMBER(7,2)
DEPTNO NUMBER(2)
SQL>
Expected:
SQL> desc emp
Name Null? Type
EMPNO NOT NULL NUMBER(4)
DEPTNO NUMBER(2)
ENAME VARCHAR2(10)
JOB VARCHAR2(9)
MGR NUMBER(4)
HIREDATE DATE
SAL NUMBER(7,2)
COMM NUMBER(7,2)
SQL>
Regards

I would not even dream of doing such thing on a production database :(How about DBMS_REDEFINITION? It allows us to do redefinition stuff online.
A little example:
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2    (empno number primary key,
3     empname varchar2(30),
4     deptno number,
5     address varchar2(50));
Table created.
SQL> insert into emp
2 select rownum,
3         'EMPLOYEE ' || rownum,
4         mod(rownum, 10) + 1,
5         'ADDRESS ' || rownum
6    from dual
7 connect by level <= 100;
100 rows created.
SQL> commit;
Commit complete.
SQL> desc emp
Name                                                  Null?    Type
EMPNO                                                 NOT NULL NUMBER
EMPNAME                                                        VARCHAR2(30)
DEPTNO                                                         NUMBER
ADDRESS                                                        VARCHAR2(50)
SQL> exec dbms_redefinition.can_redef_table(user ,'EMP', dbms_redefinition.cons_use_pk)
PL/SQL procedure successfully completed.
SQL> create table emp_new
2    (empno number primary key,
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4     empname varchar2(30),
5     address varchar2(50));
Table created.
SQL> exec dbms_redefinition.start_redef_table(user, 'EMP', 'EMP_NEW', options_flag => dbms_redefinition.cons_use_pk)
PL/SQL procedure successfully completed.
SQL> exec dbms_redefinition.finish_redef_table(user, 'EMP', 'EMP_NEW')
PL/SQL procedure successfully completed.
SQL> desc emp
Name                                                  Null?    Type
EMPNO                                                 NOT NULL NUMBER
DEPTNO                                                         NUMBER
EMPNAME                                                        VARCHAR2(30)
ADDRESS                                                        VARCHAR2(50)
SQL> set linesize 1000
SQL>
SQL> select * from emp where rownum <= 5;
     EMPNO     DEPTNO EMPNAME                        ADDRESS
         1          2 EMPLOYEE 1                     ADDRESS 1
         2          3 EMPLOYEE 2                     ADDRESS 2
         3          4 EMPLOYEE 3                     ADDRESS 3
         4          5 EMPLOYEE 4                     ADDRESS 4
         5          6 EMPLOYEE 5                     ADDRESS 5
SQL> drop table emp_new;
Table dropped.Regards.

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Resetting column sequence in SQL

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